Numerical aspects for physically accurate Direct Numerical Simulations of turbulent jets

Sharan, Nek; Bellan, Josette

doi:10.2514/6.2019-2011

Cited by 3 publications

(1 citation statement)

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“…The axial grid resolution is chosen to resolve all spatial scales overwhelmingly responsible for the dissipation. Following the approach outlined in [21], for a Re D = 5000 jet simulation, the Kolmogorov length scale η K = 0.0041 (x − x 0 ), where x 0 denotes the virtual origin. A stretched grid designed accordingly is used for present simulations.…”

Section: Numerical Detailsmentioning

confidence: 99%

Direct numerical simulation of high-pressure mixing in turbulent jets

Sharan¹,

Bellan²

2019

Preprint

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Combustion in automotive and aerospace applications employing diesel, gas turbine and liquid rocket engines is preceded by injection and mixing of fuel and oxidizer at high pressures, often exceeding mixture critical values. Experimental observations indicate that the jets injected at supercritical pressures exhibit significantly different dynamics than the jets at subcritical conditions, owing to the lack of distinct liquid and gas phases in supercritical state. As a result, the averaged flow quantities such as the potential core length, jet spatial growth rate and velocity decay profiles differ in the two conditions, resulting in different mixed-fluid distributions. In this study, turbulent jet direct numerical simulations (DNS) are performed to examine the variations in statistics between injection of Nitrogen (N 2 ) in Nitrogen (N 2 ) at subcritical (perfect-gas) and supercritical conditions. Isothermal round jets at Reynolds number (Re D ), based on jet diameter (D) and jet orifice velocity (U 0 ), of 5000 and Mach number of 0.6 are considered. For mixing analyses, a passive scalar transported with the flow is examined.

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Section: Numerical Detailsmentioning

confidence: 99%